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RECEIVER SIGHT Filed Jan. so, 1928 W M m m T. T A m? V 1M Patented May 7, 1929.

UNITED STATES PATENT @FFTCE.

JOHN H. REDFIELD, OF DENVER, COLORADO, ASSIGNOR TO FRANK P. KELLOGG, 01 DENVER, COLORADO.

RECEIVER SIGHT.

Application filed January 30, 1928.

This invention relates to a gunsight, more particularly to a rear sight of the type known as a receiver sight. A sight of this type is designed to be attached to the side of the receiver of a rifle and is provided with means for adjusting the height oi. the sight for distance and the lateral position of the sight for Windage.

In a sight of this character it is essential that the sight member always occupy the same position when the various sight supporting members are brought to the same position. In other words, after the gunner has determined the proper setting for his sight for a desired distance it is essential that when the sight be brought to this setting it will be in the proper position for shooting at this distance. In order to accomplish this, there must be absolutely no lost motion in any of the various adjustments of the sight.

The principal object of this invention is to provide a sight of this character in which all wear or other lost motion in the various adjustments can be taken up as the occasion requires so that the sight will remain accurate throughout its life.

Another object of the invention is to provide a sight of this character in which the height can be instantly set without rotating any screws or the like and in which this setting will not depend upon the threads in the adjusting screw.

Other objects and advantages reside in the detail construction of the invention, which is designed for simplicity, economy, and efficiency. These will become more apparent from the following description.

In the following detailed description of: the invention reference is had to the accompanying drawing which forms a part hereof. Like numerals refer to like parts in all views of the drawing and throughout the description.

In the drawing:

Fig. 1 is a perspective view of my improved receiver sight in place on the receiver of a rifle of the Springfield type.

Fig. 2 is a vertical cross-section through the sight taken on the line 2-2, Fig. 1.

Serial No. 250,477.

Fig. 3 is a vertical section taken on the line 3-3, Fig. 2.

Fig. 4 is a similar section taken on the line 4-4, Fig. 3.

Fig. 5 is a detail view looking toward the inside of the slide and bridge of the sight removed from the base block.

Fig. 6 is a cross section taken on the line 66, Fig. 5.

Fig. 7 is a detail cross-section taken on the line 77, Fig. 3.

In the drawing, a rifle is illustrated in Fig. 1 and designated in its entirety by the numeral 10. The receiver of the rifle is illustrated at 11. The invention is attached to the receiver 11 by drilling and tapping two screw holes in the receiver. These holes register with similar counter-sunk holes 12 formed in a base block 13 which supports the sight mechanism. The inner face of the block 13 is contoured as illustrated to iit to the contour of the rifle receiver.

A slide 14: is arranged so that it can be raised or lowered to any set position within the block 13. The slide 1 1 carries a bridge 15 which extends laterally across the rifle 10 and slidably supports a sight member 16. The sight member 16 is threaded to receive any desired type of sighting disc such as illustrated at 17.

The slide 14 [its into a vertical dove-tailed groove in the base block 13. One side of this groove is milled into the material of the block as shown at 18, Fig. 7. The other side coinprises a dove-tail plate 19 which is secured adjacent its one extren'li'ty to the block 13 by means of a screw 20. The other extremity of the dovetail plate 19 is clamped against the block 13 by means of a clamp lever 21 carried on a threaded stud 22. The threaded stud screws into an internally and externally threaded take-up nut 23 which is threaded into the block 13. The take-up nut 23 is provided with a screw driver slot by means of which its position within the block 13 can be adjusted. By this arrangement the slide 14 can be firmly clamped to the block 13 by means of the clamping lever 21.

It is essential that the clamping lever 21 ride vertically of the block as shown in Fig. 1", and as its threads wear it will gradually tend to occupy a position other than vertical when clamped in place. This wear can be accommodated by adjusting the nut 23 to a greater or less depth within the block 13 so as to bring the lever 21 to the desired vertical position. The internal and external threads on the nut 23 must be of opposite hand so that clamping the lever in place will not rotate the nut. By this arrangement all wear in the slide clamping action can be quickly and easily taken up so that the slide will at all times be firmly clamped in place and all rocking motion eliminated.

To maintain the slide at any desired height within the block 13 a rack block 21 is provided which is secured to the inner face of the slide 14 and fits within a milled groove 25 in the block 13. A vertical micrometer screw 26 is threaded into the top of the rack block 24 and extends through the top of the slide terminating in a knurled head 27. By rotating the knurled head 27 the relative position of the rack block 24: upon the slide 14 can be changed. The rack block is maintained in place against the slide by a screw 28 which projects within the slide and within the rack block through a slotted opening 29, its head being positioned in the hole which is drilled longitudinally through the block to receive the screw 26. This hole is designated by the numeral 30.

The rack block 2 1 is maintained in any desired vertical position within the block 13 by means of a latch bolt 31 which passes into the side of the block and is cut away as shown in Fig. 7, to pass under the rack block 2 1. On the far side of the cut away portion the latch bolt is provided with teeth which engage corresponding teeth 32 upon the rack block. The teeth of the latch bolt 31 are maintained in engagement with the teeth 32 by a spring 33 which acts to force the latch bolt outwardly.

Should it be desired to change the vertical position of the slide 14, the latch bolt 31 is depressed with the finger until its teeth disengage the teeth 32 of the rack block 2 1. The slide then is entirely free from the block 13 and may be raised or lowered to any desired position. When this position is reached, the latch bolt 31 is released and the spring 33 will force the latch bolt teeth into the rack block teeth, firmly locking the slide in place. Should it then be found that a very slight adjustment is necessary in the height of the slide the knurled head 27 is rotated so as to change the relative position of the slide with reference to the locked rack block. when the final adjustment has been made the clamping lever 21 is tightened so that accidental movement of the slide is impossible. The head 27 is provided with any of the usual clicks 34 to allow it to rotate only in pre-determined intervals.

Elevation of the slide is only required by distant shooting. For close shooting or point-blank range, the slide is lowered to what is denominated the point blank position. This position is determined by the setting of a point blank screw 35 which contacts with the top of the block 13 and sets the lowest slide position.

The only points where wear can occur in, the vertical adjustments of the sight are in the dovetailed groove for the slide; in the threads of the screw 26; and between the teeth of: the latch bolt and the rack block. The first wear is taken up by the clamp screw 21 and its nut 23; the second wear is taken up by splitting the rack block 21, as shown at 36, and providing a clamp screw 37 for clamping the split together so that the rack bar will snugly engage the screw 26 at all times; and the last wear is automatically adjusted by the spring 33 which will always force the co-act-ing teeth together regardless of their wear, that is, as the teeth wear they will pass further into each other, but always with their faces in firm engagement.

In order to prevent the latch bolttrom talliug from the block 13 when the slide is er.- tirely removed therefrom, the-adjustable nut 23 is so positioned that it will pass into the opening provided for the latch bolt as shown in Fig. 3, the latch bolt being notched as shown at 38 to pass the nut. This construction absolutely prevents the removal of the latch bolt 31 until the take-up nut 23 has been removed.

The slide let is formed integrally with the bridge 15. The bridge extends at right angles to the slide across the top of the gun and is provided with a dove-tailed groove 39 in which is slidably mounted the sighting member 16. The sighting member is moved along the groove 13 by means of a windage screw 40 which passes throughout the length of the groove and through the dove tailed base of the sighting member.

Sights of this character have heretofore been unsatisfactory because of the fact that the threads of the windage screw wear so as to prevent a definite lateral placing of the sighting member. In this invention, this wear is accommodated by vertically splitting the sighting member 16 as shown at 4:1 so that it forms a split nut upon the windage screw. As the threads of the screw wear, this split can be widened by means of a set screw 42 which is so placed in the sighting member 16 that its point will engage the opposite side of the split as it is tightened. Thus, the sight ing member can be brought into firm engagement with the windage screw at all times.

Another point of wear in a sight of this character is between the dove tailed base of (.IEEOViEI FHGAL 1N8 i R u M e in T the sighting member and the dove tailed groove 39 in the bridge. Should wear occur here, a loose twisting motion is possible in the sighting member. In the present invention, this can be avoided and is accommodated by placing a yoke 43 across the end of the bridge and across the end of the groove 39. This yoke is provided with a set screw 44 which, when tightened, will squeeze the twosides of the groove 39 toward each other and firmly clamp the sighting member within its seat. The yoke 43 also serves as a bearing for the outer extremity of thewindage screw 40, the extremity of which is provided with a knurled head, 45, the rotation of which adj usts the lateral position of the sighting memher. The head 45 is provided with any of the usual clicks, preferably of the type engaging notches in its under surface to prevent accidental rotation thereof.

As is usual in sights of this type a range scale 46 is provided on the slide which registers with a pointer 47 on the block 13 to show the vertical setting of the sight and a windage scale 48 is carried by the bridge 15 which registers with the center line of the sighting member 16 to show the windage setting.

While a specific form of the improvement has been described and illustrated herein, it is desired to be understood that the same may be varied, within the scope of the appended claims, without departing from the spirit of the invention.

Having thus described the invention, what I claim and desire to secure by Letters Patent is 1. A gunsight comprising a base block adapted to be secured to a gun alongside thereof; a sight supporting member vertically slidable in said base block and adapted to extend over said gun to support said sight there over; bloc tically slidable on said sight support Hg mberf ascrew adapted to adjust the'vertical position of said rack block upon said sight supporting memher and means for locking said rack block in said base block at any desired vertical position tllerein. ""----'--M..-.HM. 1A.. a l

2. A gunsight comprising a base blocl adapted to be secured to the receiver of said gun alongside thereof; a sight supporting member vertically slidable in said base block and adapted to extend over said gun to sup port said sight thereover; a rack block vertically slidable on said sight supporting member; a screw adapted to adjust the vertical position of said rack block with reference to said sight supporting member; means for locking said rack block in said base block at any desired vertical position therein, said means comprising a latch bar adapted to extend laterally beyond said rack bar; teeth in said extending-beyond portion adapted to engage co-acting teeth in said rack bar; spring means adapted to maintain said co-acting teeth in engagement; and means for preventing the withdrawal of said latch bar, said means comprising a removable projection in said base block adapted to extend within an elongated depression in said latch bar.

3. A gunsight comprising a base block adapted to be secured to a gun alongside thereof; a sight supporting member vertically slidable in said base block and adapted to extend over said gun to support said sight thereover; a rack block vertically slidable on said sight supporting member; a screw adapted to adjust the vertical position of said rack block upon said sight supporting member; means for locking said rack block in said base block at any desired vertical position therein, there being a longitudinal hole through said rack bar for the reception of said screw; means for holding said rack bar in place upon said base block, said means comprising a headed screw adapted to pass through a slotted opening in said rack bar and be threaded into said base block, the head of said screw being arranged to travel in said hole.

4. In a gunsight having a base block adapted to be attached to the side of a gun and a sight supporting member vertically slidable within said base block, means for clamping said member in any desired vertical position in said base block comprising a dove-tailed plate adapted to overlap one side of said member; a clamping screw adapted to force said plate toward said base block so as to clamp said member therein; and means for adjusting the clamping position of said clamp screw comprising a nut adapted to be threaded into said base block, said nut having internal threads for the reception of said clamp screw.

5. In a gunsight having a sight supporting member adapted to extend laterally across said gun, a sight member; a dove-tailed base on said sight member arranged to slide in a longitudinal dovetailed slot in said sight supporting member; an adjusting screw extending longitudinally of said slot and through said sight member and means for adjusting the width g f said slot g as to preventdost-metifii in saidsi'glit I116IDBTTCOIH- prising a clamping member adapted to extend across said slot and means on said clamping member for forcing the two sides of said slot towards each other.

6. In a gunsight having a sight supporting member adapted to extend laterally across said gun; a sight member; a dove-tailed base on said sight member arranged to slide in a longitudinal dove-tailed slot said sight supporting member; an adjusting screw extending longitudinally of said slot and through said sight member and means for adjusting the width of said slot so as to prevent lostmotion in said sight member, comprising a clamping member adapted to extend across said slot; means on said clamping member said sight supporting member at its one eX- for forcing the tWo sides of said slot towards tremity and having an adjusting screw in its each other, said clamping member eomprisother extremity adapted to contact With said 10 ing a U shaped bar adapted to extend around-flight supporting member to force the two 5 the extremity of said sight supporting memsides of said slot towards each other.

her, said slot being formed through said ex- In testimony whereof, I afiix my signature.

tremity, said U shaped bar being secured to JOHN H. REDFIELD. 

